SNFA Super Precision Angular

44 Pages·2005·2.88 MB·English

SNFA Product Range
Quick Series Interchange and Page Reference
SERIES SNFA FAG BARDEN FAFNIR GMN NSK RHP SKF SNR PAGE
ISO18 SEA B71800 -- -- -- -- -- 71800 71800 24
ISO19 SEB B71900 1900H 9300WI S61900 7900 7900 71900 71900 25
ISO19 VEB,HB HS71900 -- 99300WN -- BNC19 XS7900 71900CE -- 26,28
ISO19 HB../S HSS71900 -- -- -- -- -- S71900B -- 28
ISO10 EX B7000 100H 9100WI S6000 7000 7000 7000 7000 30
7000CC
ISO10 VEX,HX HS7000 -- 99100WN SH6000 BNC10 X-T7000 -- 31,33
7000CE
VEX../S S7000B
ISO10 HSS7000 -- -- -- -- -- -- 31,33
HX../S S7000C
ISO02 E200 B7200 200H 200WI S6200 7200 7200 7200 7200 35
ISO02 BS200 76020 -- -- -- -- -- BSA2 -- 36
* Please note: The interchange table provided is intended as a quick reference for general information
purposes only and does not in any way guarantee that all bearings will perform to the same
operating standards.
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TABLE OF
CONTENTS
The SNFA Group 2
Technology
3
Quality System
7
CHROMEX®40 - A New 8
Material for Spindle Bearings
Ceramic Material 10
VEB and VEX High Speed Bearings in
11
“H1” and “G1” Air - Oil Lubrication
Sealed Bearings 12
Product Range and Table of Equivalents 14
Symbols and Units 15
Precision Tables (ABEC5 - ABEC7 - ABEC9) 16
Assembly Tolerances 17
Errors of Form 18
Grease Quantity 19
Bearing Marking and Packaging 20
Bearing Identification Code
21
ISO Series and SNFA Production
22
Limiting Speed and Preload Calculation 23
SNFA Bearing Tables: SEA Series 24
SEB Series 25
VEB Series 26
VEB/NS, VEB/XN Series 27
HB, HB/S Series 28
HB/NS, HB/S/NS, HB/S/XN Series 29
EX Series 30
VEX, VEX/S Series 31
VEX/NS, VEX/S/NS, VEX/S/NX Series 32
HX, HX/S Series 33
HX/NS, HX/S/NS, HX/S/XN Series 34
E 200 Series 35
Ball Screw Support Bearings 36
BS200, BS200/S, BS (Special) Series
Ball Screw Bearing Cartridge Units 37
BSDU, BSQU, BSQU/1 Series
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THE SNFA
GROUP
THE SNFA
Since 1952, the SNFA Group has distinguished
itself in the market of high performance ball and
roller bearings and has gradually implemented
GROUP an organizational structure specializing in:
• Special ball and roller bearings for
the aerospace and related industries;
(cid:127) High-precision angular contact ball
bearings for machine tools and
similar applications.
Over the years, the high level of expertise in these
two fields has allowed the development of often
unique technologies for the design and
PRODUCTION UNITS
manufacture of bearings to the highest quality.
SNFA SA (France) In Italy, the SNFA Group is represented by
Aerospace bearings Somecat S.p.A., who, along with its sister
company in the UK, SNFA Bearings Ltd., is a
Somecat S.p.A. (Italy)
Precision ball bearings leading manufacturer of super precision angular
contact bearings primarily for machine tools.
SNFA Bearings Ltd. (U.K.)
Precision ball bearings
MARKETING UNITS
SNFA SA (France)
Aerospace bearings /
Precision ball bearings
Somecat S.p.A. (Italy)
Precision ball bearings
SNFA Bearings Ltd. (U.K.)
Precision ball bearings
SNFA Präzisions -
Wälzlager (Germany)
Precision ball bearings
SNFA S.A. Fribourg
(Switzerland)
Precision ball bearings
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THE
TECHNOLOGY
The Technology. . .
State-of-the-art technology and constant upgrading is applied
throughout the SNFA Group.
Each process, from design to testing, from manufacturing to
inspection, is within a procedure that benefits from the necessary
resources and facilities.
Grinding and superfinishing are part of a complex cycle of operations
involving all the surfaces of the bearing rings and these operations
require the use of special high-quality CNC machinery. For this
reason, a new area within the Somecat facility was developed using
state-of-the-art technologies.
Rings are manufactured from bar, tube or forging. The most common
raw material used is 100Cr6 that must be of the highest quality and
inclusion free.
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CONTINUED. . .
Matching is the operation whereby two or more bearings
are brought together for preloading into sets.
In order to obtain a precise preloading, SNFA uses
specialized equipment and the
whole process is strictly
controlled.
Cotton fabric reinforced
phenolic resin cages are
machined from tube. Good
dynamic behaviour of this vital
bearing component depends on
raw material homogeneity
and precise geometry being
obtained during manufacture.
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. . .CONTINUED
Final inspection of rings is performed under
environmentally controlled conditions using
specialized equipment that simultaneously measures
all geometric parameters.
Marking ensures complete
identification of the product.
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CONTINUED. . .
Product design, from analysis computer programs through to
laboratory testing, is performed in line with criteria conforming
to ISO 9000 standards.
Functional tests are carried out in the SNFA laboratories and are
targeted at finding new and innovative solutions for the benefit
of our customers.
SNFA already offers its customers the
technology for optimizing the choice of
bearings during the design stage of a
new application.
Recently SNFA has developed a new
program, SECBA, that analyzes bearing
performance by taking into account the
whole of the spindle assembly.
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THE QUALITY
SYSTEM
The Quality System
All of SNFA production is under quality
management systems audited and
approved to ISO 9001:2000 standards
that encompass safety, environment,
human resource and continuous
improvement strategies. This striving for
excellence by Somecat and SNFA
Bearings Ltd. testifies that Total Quality
is the main feature of the companies’
production activities.
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CHROMEX®40
This special highly-alloyed steel, resulting from the
most advanced aeronautical and aerospace
FATIGUE technologies, now also allows for the production of
RESISTANT
precision bearings for machine tools. Its innovative
composition, with elements such as molybdenum,
chromium, vanadium and nitrogen, allows for a more
CORROSION
RESISTANT homogeneous structure and increases its resistance
to fatigue and corrosion.
MORE HOMOGENEOUS Chromex®40 is the most reliable, stable and
STRUCTURE
innovative solution for high performance of bearings
in machine tools and electrospindles.
Life 500%
200%
100Cr6 = L10h
100Cr6 + NS = L10 h x 2
100%
Chromex® 40 + NS = L10 h x 5
FFaattiigguuee LLiiffee
40000 rpm
1400
1200
1000
800
h)
e ( 600
Lif 400
200
0
1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000
Contact Pressure [MPa]
Chromex ® 40
Hybrid
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